[August 25, 2026]

Maxell Develops ER Battery-Sized All-Solid-State Battery Module Supporting Wireless Charging*1

Maxell, Ltd. (TOKYO: 6810) has developed an all-solid-state battery module compatible with a 1/2AA-size (diameter 14.5 mm, height 25.2 mm) lithium thionyl chloride battery (hereinafter ER battery), along with a dedicated charger^*2. The module is available in two versions, one capable of operating at temperatures up to 125°C and the other up to 150°C.

This press release features multimedia. View the full release here: https://www.businesswire.com/news/home/20260825352141/en/

All-Solid-State Battery Module Supporting Wireless Charging and dedicated charger (Under development), Left: Module, Center: Internal Module Structure, Right: Dedicated charger

Currently, ER batteries are widely used in industrial equipment backup systems, smart meters, and IoT devices. However, because ER batteries are non-rechargeable, periodic battery replacement and the disposal of used batteries present ongoing operational challenges.
The newly developed module integrates a wireless charging circuit, highly heat-resistant and highly reliable all-solid-state batteries, and a boost circuit into a 1/2AA-size, while delivering the same 3.6 V output voltage as conventional ER batteries. When used in combination with the dedicated charger^*2, it enables wireless charging^*1 capability to be added to existing equipment without requiring complex circuit design.
By incorporating rechargeable all-solid-state batteries, the module helps reduce battery replacement work and minimize battery waste. In addition, its wireless charging^*1 capability eliminates the need for openings in device housings for battery replacement or charging, making it suitable for equipment that requires a high degree of sealing performance.

One potential application of this module is temperature loggers for food used in the sterilization process of retort foods require both heat resistance and a high degree of sealing performance to prevent moisture ingress.
Currently, Maxell is conducting a joint feasibility study with House Foods Corporation on a temperature logger for food process using this module.

*1 Wireless charging: This function may not be available depending on the enclosure material used in the customer's equipment.
*2 Dedicated charger: A dedicated design tailored to the customer's equipment is required.

For more details, please refer to the information here.

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